Eureka weekly sentinel. [volume] (Eureka, Nev.) 1887-1902, 1887-11-19

OUNCES SILVER fkk thNI LhAps
24,1s Al
1890 B
3s.al
3S.77 &c
1871 40
4S6l 81
1875 81
l7.01 80
ISL CT
1910 ~
34.C3 rs
1919 46
The samples that were sent to New
York and California yielded in addition to
the silver and lead contents, as We learn,
from 81 Is to IS IL per ton in gold. The
vein from end to end, as shown by
the exposures on it, varies from 3 to Il
feet in thickness, in some places the quartz
gang being Predominant, m in Others the
lead appearing plentiful and rich. An in
cline shaft having been started at the
southeast end. the vein there exposed is
about IL feet thick, OF which s feet are al
most solid galena. An incline shaft sum-
on the Dead Broke mine is down 40 feet,
showing a strong vein from top to bottom,
the lead pr~edominating over the quartz.
The average assay value of the vein, in
bulk, is estimated at . fraction over 10
ounces Of silver to the ton, and p per cent
of lead. This will concentrate up to 56
ounces savsy and 60 per cent of lead, to say
nothing of the gold contents, which are
not figured on. The present appearances
indicate that the estimate here given is
below the actual value, but that yet re-
mains to be proven.
The vein is being opened at two Of the
most available points by tunnels, the lower
one of which has been started, Immediately
above the mill site. This will cut the
vein at abont LOCO feet, and running along
its course viii tap it to a depth of about
LOO feet. The upper tunnel has been
driven 140 feet to the vein, and continued
| along its course % feet. from which point
an upraise has been made to the surface,
| showing a depth Oh the vein of 166 feet.
| This tunnel is now in 233 feet, and is Icing
| pushed ahead with the aid of a Burleigh
drill at the rate of 81 feet every shift of 10
hours. The vein, as it is exposed by
developments on this level and through the
upraise, shows ar average thickness of
8 feet. II having been satisfactorily
proved that the ore can be very proftably
worked by concentration, a mill is to be
erected, for which the building material is
already on the ground, and the machinery
is in transit. The mill will have a capacity
for working 100 tons of ore per day, with
Is concentraters, only 9 of which will be
put in this Fall, but 8 more will be added
next Spring. An.
AUTOMATIC IRON TRAMwAY
VIII be built a distance of 5000 feet, by
which the ore will be conveyed from the
upper tunnel to the ore bins. situated
above the mill. The latter will be so
placed that the ore from the lower tunnel
can be run out in cars and dumped into
them from the tunnel track.
The site for
TEE MILLING PLANT
Has been selected with excellent judy
ment at the head of the main canyon,
where the base of the mountain forms a
projection between two tributary canyons,
and rises at an angle of about &c degrees
from the head of the basin in which the town |
is situated. 1t is reached by an evenly
graded road and is well protected from the
danger Of snow slides that are liable to oc.
cur in Winter by the natural deep de-
pressions on each side of it. The grading |
framing of the heavy timbers for the
foundation is well Under way. The main
mill building will be S9x40 feet, and, in
Guiding a screen tower, from the sills to
the peak of the roof, will be y feet in
height. The crusher house, further up the |
hill, viii be 26x20 feet, and SO feet in |
height. These two buildings will be con- |
nscted by another building "a feet in length
in which will be contained the furnaces of |
the dry-klns, and an automatic feeding ap- |
paratus. The engine house will be 30x3S |
feet, and will contain a rs horsepower
Buckeye engine. The cylinder is Is
inches in diameter, "a inch stroke, and
will run 100 revolutions per minute. It's |
power is in excess of present Requirements |
The boiler, which was made by the Ma. |
tional Water Tube Boiler Company, at |
New Brunswick, New Jersey, is about 100 |
horsepower.
Ore bins will be constructed above the
mill. The crusher house, into which the |
ore will be brought from the ore bins, will
contain two of krom's jaw crushers, one
situated above the Other. The upper one
is a coarse crusher, and the ore being fed
into it, will fall through a chute to
the lower one, which is a fine crusher, and
drought it, will fall into one Of two
dry-kilns, where the moisture will be
thoroughly expelled from the ore. From
the lower end of the dry. kilns it will be
by an automatic carrier, which
will deliver it to the first pair of Krom's
rolls. Passing. through the rolls, the
material will fall through a chute
to the first elevator, by which it will be
to q screen on the second floor.
Here the first sizing takes place. The
pulp that falls throuh this screen will pass
20 the second elevator, by which it will be
carried up to the sixth floor. The returns
from this screen will fall to the second
pair of rolls, thence passing again to the
irst elevator. The pulp that was raised to
The sixth floor will now pass to a series of
,hree screens, each of them situated above
,ower, and by these the sizing will be com.
oleted, the product being delivered into
pins on the third floor. From these bins
he sized pulp will be delivered through
pipes to the concentration on the second
1oor, where it will be concentrated, the
'allings passing OF through pipes to the
bins below, while the concentrates will
BASS down to a second series of concentrators
IN the lower floor, the concentrates from
which will pass to bins, ready for delivery
% cars, by which they will be carried out to
The last set of ore bins.
~IhroughOut the mill a complete system
IT dust chambers will be arranged through
which the dust from all the machines is to
70 collected and drawn into a large dust
hamber, where it will be settled, and can
,e drawn off for treatment. The dry or
pneumatic system of concentration will
,e used. 1t is the invention of S, r.
Arom, the well-known engineer of New
ork, whose crushing rolls are in use in
he Wenban mill at Cortez, and are :
avorably known to millmen generally. ,
The jaw crushsrs, screen and dry-kilns are 5
his manufacture, and the entire outfit. 8
. well as the plans, were furnished by j
i'm. Everything will be handled autonat. :
cally from the time it enters the mill until ,
lelivered into the ore bins, and the plant {
) calculated to be the most complete con.
entrating works ever made. MIR. Krom
aVing been given full latitude in the mat
er writes that this mill will be the ,
nost perfect one he has ever planned, and 9
Xnerienced millmen say that In r. =. i.